<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        class Cat {
            constructor(name, color) {
                this.name = name;
                this.color = color;
            }
            static hello = "你好"
            static isCat(arg) {
                if (arg.constructor == Cat) {
                    return true;
                }
                return false
            }
            say() {
                console.log(this.name, this.color);
            }
            satHello() {
                console.log("hello");
            }
        }
        console.log(Cat.hello);

    </script>
</body>

</html>